We can get guest's memory block information by using command
"guest-get-memory-blocks", the returned value contains a list of memory block
info, such as phys-index, online state, can-offline info.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>

*replaced guest-triggerable assertion with an error msg

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>